Windows 8 Constantly Loses Internet Connectivity

Hi, I have a new Dell Inspiron 17-3721 with Windows 8. It is connected to a Linksys WRT160NL Wifi router.
The laptop occasionally loses its internet connection (approx. once per hour, even as I type this), and can't even connect to the router (neither ping nor its web page). When I look at the network settings, everything seems to be OK (IP address, DNS and
gateway settings), except that it reports no internet connectivity.
Other computers in the network running Win XP, Vista or Android don't have any problems at all, so I am dead sure it's not a problem with the router or my ISP.
Sometimes the problem goes away after a few minutes, but usually it persists for a long time.
What is odd: When Internet Explorer times out it shows me a troubleshoot button. When I click it, usually connectivity is restored after a few seconds, while troubleshooter is trying to find a problem. I believe it pulls something straight while analyzing
the network. I only wish I knew what.
I uninstalled McAfee security center because someone suggested it might be the root of the problem, but it didn't help.
Windows is up to date, also the BIOS has the latest version (from 3 days ago).
Any other hints?

A small update: I disabled IPv6 because somewhere it was suggested that this might be the problem, but it didn't help.
I compared the output of ipconfig/all between working and non-working network, but there is no difference. Everything looks the same.
Tracert to the DNS server doesn't help. Since not even the wifi router (which is also the DHCP server and the default gateway) is available (ping 192.168.1.1 times out), tracert stops there. I'm using my ISP's DNS servers which are assigned
via DHCP.
Maybe it's not necessary to mention that again, but: All other hosts connected to the wifi router can always ping it, and they can always query the DNS servers and they can always open web pages and they can always send emails and whatnot. It is unbelievable
that the latest version of windows has a problem with such a basic issue.
I installed Ubuntu on the same laptop today. So far it didn't have a problem with the network. I do admit that the installation of wifi was a little less out of the box.
I haven't found the time to use netmon yet. I wonder what it would tell me. I have never used netmon before. Is it comparable to wireshark?
In case someone wants to look at the output of ipconfig, here it is:
C:\>ipconfig/all
Windows-IP-Konfiguration
Hostname . . . . . . . . . . . . : Delle
Primäres DNS-Suffix . . . . . . . :
Knotentyp . . . . . . . . . . . . : Hybrid
IP-Routing aktiviert . . . . . . : Nein
WINS-Proxy aktiviert . . . . . . : Nein
Ethernet-Adapter Bluetooth-Netzwerkverbindung:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Bluetooth-Gerät (PAN)
Physische Adresse . . . . . . . . : 9C-2A-70-BD-FC-E8
DHCP aktiviert. . . . . . . . . . : Ja
Autokonfiguration aktiviert . . . : Ja
Ethernet-Adapter LAN-Verbindung:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Broadcom Virtual Wireless Adapter
Physische Adresse . . . . . . . . : 9E-2A-70-BD-7C-E7
DHCP aktiviert. . . . . . . . . . : Ja
Autokonfiguration aktiviert . . . : Ja
Drahtlos-LAN-Adapter LAN-Verbindung* 1:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Virtueller Microsoft-Adapter für direktes
WiFi
Physische Adresse . . . . . . . . : 9E-2A-70-BD-FC-E7
DHCP aktiviert. . . . . . . . . . : Ja
Autokonfiguration aktiviert . . . : Ja
Drahtlos-LAN-Adapter WiFi:
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Dell Wireless 1704 802.11b/g/n (2,4 GHz)
Physische Adresse . . . . . . . . : 9C-2A-70-BD-FC-E7
DHCP aktiviert. . . . . . . . . . : Ja
Autokonfiguration aktiviert . . . : Ja
IPv4-Adresse . . . . . . . . . . : 192.168.1.106(Bevorzugt)
Subnetzmaske . . . . . . . . . . : 255.255.255.0
Lease erhalten. . . . . . . . . . : Dienstag, 12. März 2013 21:48:24
Lease läuft ab. . . . . . . . . . : Mittwoch, 13. März 2013 23:04:27
Standardgateway . . . . . . . . . : 192.168.1.1
DHCP-Server . . . . . . . . . . . : 192.168.1.1
DNS-Server . . . . . . . . . . . : 195.50.140.180
195.50.140.114
NetBIOS über TCP/IP . . . . . . . : Aktiviert
Ethernet-Adapter Ethernet:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Realtek PCIe FE Family Controller
Physische Adresse . . . . . . . . : B8-CA-3A-C9-8F-EF
DHCP aktiviert. . . . . . . . . . : Ja
Autokonfiguration aktiviert . . . : Ja
Tunneladapter isatap.{2B228D4A-0A46-4C64-9645-387B7EFEFBE2}:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Microsoft-ISATAP-Adapter
Physische Adresse . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP aktiviert. . . . . . . . . . : Nein
Autokonfiguration aktiviert . . . : Ja
Tunneladapter LAN-Verbindung* 4:
Medienstatus. . . . . . . . . . . : Medium getrennt
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Microsoft-6zu4-Adapter
Physische Adresse . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP aktiviert. . . . . . . . . . : Nein
Autokonfiguration aktiviert . . . : Ja
Tunneladapter Teredo Tunneling Pseudo-Interface:
Verbindungsspezifisches DNS-Suffix:
Beschreibung. . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physische Adresse . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP aktiviert. . . . . . . . . . : Nein
Autokonfiguration aktiviert . . . : Ja
IPv6-Adresse. . . . . . . . . . . : 2001:0:9d38:6ab8:1098:3e3d:3f57:fe95(Bevo
rzugt)
Verbindungslokale IPv6-Adresse . : fe80::1098:3e3d:3f57:fe95%20(Bevorzugt)
Standardgateway . . . . . . . . . : ::
DHCPv6-IAID . . . . . . . . . . . : 637534208
DHCPv6-Client-DUID. . . . . . . . : 00-01-00-01-18-9C-7E-AD-B8-CA-3A-C9-8F-EF
NetBIOS über TCP/IP . . . . . . . : Deaktiviert

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